I have had my tank setup for 6 months now and it is finished cycling but i still have a problem with dirty water. I wouldnt say its cloudy, just the clarity isnt like what it should be like at the lfs. The water isnt cloudy or green, just dirty. I have an eheim 2015 canister filter and a marineland 330 biowheel but i cant seem to get crystal clear water. Does that seachem purigen stuff make a big difference???